SOLUTION: how do i find the other endpoint when the other Endpoint (10,12) and midpoint (6,9)?

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Question 772993: how do i find the other endpoint when the other Endpoint (10,12) and midpoint (6,9)?
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
how do i find the other endpoint when the other Endpoint (10,12) and midpoint (6,9)?
midpoint formula:
%28%28x1%2Bx2%29%2F2%29,%28%28y1%2By2%29%2F2%29
let (x,y)=coordinates of other endpoint
%28%2810%2Bx%29%2F2%29,%28%2812%2By%29%2F2%29=(6,9)
..
(10+x)/2)=6
10+x=12
x=2
..
(12+y)/2)=9
12+y=18
y=6
..
(x,y) coordinates of other endpoint: (2, 6)
check:
((10+2)/2, (12+6)/2)=(6, 9)